A friend of mine owns North Country Golf Car in Bow. He sells mostly Yamaha, which is a very dependable brand.
northcountrygolfcar.com
As to the electric vs gas question, I think it is up to personal preference, both have pros and cons. One you have to put gas/oil in, the other you have to keep charged (as well as replace the batteries every 5-7 years or so).
I have a 1982 gas Yamaha cart. It runs pretty well considering the motor is 35 years old.